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. 1991 Sep;104(1):21–24. doi: 10.1111/j.1476-5381.1991.tb12378.x

Nitric oxide synthase in cultured endocardial cells of the pig.

R Schulz 1, J A Smith 1, M J Lewis 1, S Moncada 1
PMCID: PMC1908256  PMID: 1723915

Abstract

1. Endocardial cells release factors which regulate myocardial contractility and guanosine 3':5'-cyclic monophosphate (cyclic GMP) levels. One of these factors is indistinguishable from endothelium-derived relaxing factor (EDRF). 2. The effluent from pig heart endocardial cells cultured on microcarrier beads caused the relaxation of a pig coronary artery ring denuded of endothelium. This relaxation was enhanced by a combination of superoxide dismutase and catalase and was attenuated by haemoglobin, which binds nitric oxide (NO), and by inhibitors of NO synthase, NG-monomethyl-L-arginine (L-NMMA) or NG-nitro-L-arginine. 3. A Ca(2+)-, L-arginine- and NADPH-dependent enzyme activity which generated NO was detected by a specific spectrophotometric assay in cytosol prepared from endocardial cells. The formation of NO was inhibited in a concentration-dependent manner by L-NMMA (but not D-NMMA) and this could be partially reversed upon addition of excess L-arginine. 4. Like endothelial cells from the blood vessels, the endocardial cells possess the ability to synthesize NO, which may act to regulate myocardial contractility.

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Selected References

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